After his impetuous musician girlfriend, Samantha, dies in an accident shortly after they had a fight (and nearly broke up), Ian Wyndham, a grief-stricken British businessman living in London gets a chance to relive the day all over again, in the hope of changing the events that led up to her getting killed.
Unfortunately the movie If Only is not yet available on HBO Max.
| Production | Jill Gilbert | Producer |
| Production | Jennifer Love Hewitt | Producer |
| Directing | Gil Junger | Director |
| Camera | Giles Nuttgens | Director of Photography |
| Sound | Adrian Johnston | Original Music Composer |
| Visual Effects | Brian Jennings | Visual Effects Supervisor |
| Production | Gil Junger | Producer |
| Writing | Christina Welsh | Screenplay |
| Production | Victoria Burrows | Casting Director |
| Costume & Make-Up | Odile Dicks-Mireaux | Costume Designer |
| Directing | Deborah Saban | First Assistant Director |
| Directing | Olivia Lloyd | Second Assistant Director |
| Production | Rachel Neale | Unit Production Manager |
| Production | Laurie Borg | Co-Producer |
| Crew | Jo McLaren | Stunts |
| Art | Les Benson | Props |
| Editing | Padraic McKinley | Editor |
| Art | Rebecca du Pont de Bie | Set Decoration |
| Production | Robert Newmyer | Producer |
| Production | Jeffrey Silver | Producer |
| Production | Scott Strauss | Co-Producer |
| Art | Joseph Bennett | Production Design |
| Editing | William M. Anderson | Editor |
| Production | Priscilla John | Casting |
| Production | Gub Neal | Executive Producer |
| Costume & Make-Up | Ameneh Mahloudji | Makeup & Hair |
| Production | Basil Iwanyk | Executive Producer |
| Costume & Make-Up | Elizabeth Yianni-Georgiou | Makeup & Hair |
| Production | Jeffrey Graup | Co-Executive Producer |
| Production | Moritz Borman | Executive Producer |
| Sound | Mike Prestwood Smith | Sound Re-Recording Mixer |
| Sound | Ruth Sullivan | Foley Artist |
| Directing | Sue Field | Script Supervisor |
| Art | Mark Raggett | Supervising Art Director |
| Art | Sarah Bicknell | Assistant Art Director |
| Art | Hattie Storey | Art Department Assistant |
| Art | Douglas Ingram | Storyboard Artist |
| Camera | Giles Nuttgens | "A" Camera Operator |
| Camera | Ian Clark | Focus Puller |
| Camera | John Evans | Clapper Loader |
| Camera | Henry Landgrebe | Clapper Loader |
| Camera | Liam Daniel | Still Photographer |
| Sound | Simon Hayes | Production Sound Mixer |
| Sound | Arthur Turner | Boom Operator |
| Crew | Robin Johnson | Cableman |
| Art | Brian Jennings | Title Designer |
| Crew | Reno Antoniades | Legal Services |
| Camera | Vince McGahon | Steadicam Operator |
| Camera | Alf Tramontin | Steadicam Operator |
| Camera | Barny Crocker | Clapper Loader |
| Lighting | David Smith | Gaffer |
| Lighting | Sonny Burdis | Best Boy Electric |
| Lighting | Tony Allen | Electrician |
| Lighting | Avelino Fernandez | Electrician |
| Lighting | Eamonn Fitzgerald | Electrician |
| Lighting | Michael Hayes | Electrician |
| Lighting | Brian Miller | Electrician |
| Lighting | Guy Minoli | Electrician |
| Lighting | Peter Goddard | Rigging Gaffer |
| Camera | Peter Myslowski | Key Grip |
| Camera | Luke Myslowski | Grip |
| Camera | Adrian McCarthy | Grip |
| Visual Effects | Stuart Brisdon | Special Effects Supervisor |
| Art | Maxie McDonald | Property Master |
| Costume & Make-Up | Annie Crawford | Costume Supervisor |
| Costume & Make-Up | Kim Grossman | Assistant Costume Designer |
| Costume & Make-Up | Tim Guthrie | Wardrobe Supervisor |
| Costume & Make-Up | Helen Ingham | Wardrobe Supervisor |
| Art | Harry Metcalfe | Construction Manager |
| Art | David Barker | Standby Carpenter |
| Art | Pat Bailey | Standby Painter |
| Directing | Henry Forsyth | Third Assistant Director |
| Directing | Rhys Summerhayes | Third Assistant Director |
| Directing | Andrew McEwan | Crowd Assistant Director |
| Production | Steve Gaub | Production Supervisor |
| Production | Mel Claus | Production Coordinator |
| Production | Victoria Morgan | Assistant Production Coordinator |
| Production | John Beharrell | Production Accountant |
| Production | Penelope Forrester | Assistant Accountant |
| Production | John Sargent | Post Production Accountant |
| Production | Simon Marsden | Location Manager |
| Production | Martin Joy | Assistant Location Manager |
| Production | Lee Robertson | Assistant Location Manager |
| Crew | Lee Sheward | Stunt Coordinator |
| Crew | Charlie Lemmer | Stand In |
| Crew | David House | Stand In |
| Crew | Ray De-Haan | Stunts |
| Crew | Jim Dowdall | Stunts |
| Crew | Steve Griffin | Stunts |
| Crew | Paul Heasman | Stunts |
| Crew | Derek Lea | Stunts |
| Production | Faith Allbeson | Casting |
| Production | Orla Maxwell | Casting |
| Production | John Einsohn | Casting Assistant |
| Crew | Gary Birmingham | Transportation Coordinator |
| Production | Lee Isgar | Production Driver |
| Crew | Waseem Barlas | Driver |
| Crew | Martin Birmingham | Driver |
| Crew | John Hollywood | Driver |
| Crew | Emma Zee | Post Production Supervisor |
| Editing | Mark Sanger | First Assistant Editor |
| Editing | Liz Rowe | Assistant Editor |
| Sound | Max Hoskins | ADR Editor |
| Sound | Christopher Ackland | Sound Effects Editor |
| Sound | Ben Barker | Sound Effects Editor |
| Sound | Colin Millar | Foley Editor |
| Sound | Mystique Holloway | Assistant Sound Editor |
| Sound | Alexandra Raveane | Assistant Sound Editor |
| Sound | Maggie Rodford | Music Supervisor |
| Sound | Alison Wright | Music Supervisor |
| Sound | Paul Englishby | Music Producer |
| Sound | Terry Davies | Orchestrator |
| Sound | Adrian Johnston | Orchestrator |
| Sound | Tony Lewis | Music Editor |
| Crew | Nick Wollage | Score Engineer |
| Crew | Steve Parr | Score Engineer |
| Production | Matthew Sanders | Publicist |
| Production | Michael Glassman | Producer's Assistant |
| Production | Maggie Moran | Producer's Assistant |
| Production | Sarah Johnson | Producer's Assistant |
| Production | Adam Green | Producer's Assistant |
| Production | Andrew Mannion | Production Assistant |
| Production | Harry Ponsonby | Production Assistant |
| Production | Justin Springer | Production Assistant |
| Production | Juliet Morris | Production Assistant |
| Crew | Glen Campbell | Unit Medic |
| Camera | Steven Hall | Camera Operator |
| Writing | Jennifer Love Hewitt | Lyricist |
| Writing | Gil Junger | Lyricist |
| Sound | Jennifer Love Hewitt | Theme Song Performance |
| Sound | Paul Englishby | Music Arranger |
| Costume & Make-Up | Veronica McAleer | Makeup & Hair |
| Crew | Sophie Cornet | Temp Music Editor |
| Crew | Gerard McCann | Temp Music Editor |
| Sound | Terry Davies | Conductor |
