Revealing mistake: When the L.A. Knights play, the exterior shots show The Staples Center, but the interiors of the basketball arena were shot in the Great Western Forum, except for the locker room which was a stage at an LA studio, and still some other shots were taped at the All Star game, in Philadelphia.
Factual error: When Calvin and Co. are tying up Bittleman so they can get Calvin's shoes back, it shows highlights from the game that's being played at that very moment between Toronto and the Knights. It shows some highlights from Vince Carter, but one of these highlights was not from the game at all. It's his windmill dunk from the actual NBA 2003 dunk comp. There are no other players on the court, only camera crew. (01:14:15)
Continuity mistake: When Calvin is meeting the team for the first time in the locker room his braids change. You can see his hair from behind and it shows his braids tied together. Then it shows a wide shot from inside the locker room and his braids are untied and hanging loose. Then it goes in for a close up and his braids are tied again. (02:06:45)
Factual error: When Calvin is watching the Knights play at the Staples Center when he is working the parking lot, the Knights are playing the Toronto Raptors, who play in a different confrence, later in the movie the Knights play the Raptors in the Staples Center again. NBA teams play teams from another confrence once on the road, and once at home.
Audio problem: In the scene in the foster home playground where Tracy Reynolds tells Calvin that he is going to adopt him, Calvin has tears (or sweat) running down his face, then the tears are gone and then they return again. However, at no time during or after the adoption conversation (or anywhere in the film for that matter) does Calvin shed any tears. They are likely from an earlier scene that was deleted.
Revealing mistake: When the three kids are sitting on the merry-go-round in the orphanage playground, look at the bars when the shot changes from Calvin to Murph. From the markings, you can see that they are the exact same bars, meaning that they decided to have the actors switch sections rather than the camera.