It is the most recent in a string of productions shot in the area, following Netflix's Havoc starring Tom Hardy and BBC's Gavin and Stacey.
Salvable stars Planet of the Apes' Toby Kebell as a boxer who grapples with his past, while LaBeouf plays an old friend and bad influence.
It portrays Kebell struggling to escape a small town while battling a damaged relationship with his teenage daughter.
Gloomy shots show a raw and rugged seaside town, with boxing brawls on the port of Barry, shabby side streets and hazy tides at Penarth pier.
Directed by Bjorn Franklin and Johnny Marchetta, the drama also stars Highlander actor James Cosmo and Kíla Lord Cassidy.
LaBeouf was spotted taking selfies with residents while filming around Barry and Penarth in 2024.
But a tattooist got to know crew members much better – after offering them free body art.