Deliberate mistake: If this movie takes place 7 years after the original, how could his daughter be 13? He was part of a government project, I doubt they let them leave for relationships.
Suggested correction: This is a retconned film made after 2 other direct-to-video Universal Soldier movies were made. While the film is considered non-canon in the series, in the film itself, the facts of the original are altered to allow Luc to have a daughter.
Exactly. If this movie changes things that happened in previous films than they don't make sense in context to the series, that's a mistake.
Essential the film can be considered the same as a reboot. Reboots and remakes can alter characters without being considered mistakes because they're not actually part of the film series, just like "Universal Soldier: The Return" is not part of the Universal Soldier film series. However, changes to characters in retconned films, shows, or books, by definition, are not mistakes.
Deliberate mistake: At about 1 hour 24 minutes, when Tom Sizemore is looking in the mirror, his injured lip goes from original right side to left side.
Deliberate mistake: When Dooley looks at the photo of himself, Jerry Lee and his wife Tracey, it's obviously a still shot from the first movie, as the angle the picture is taken from was obviously not taken by anyone else as they were the only two in the apartment with Jerry Lee at the time. (01:11:40)