Continuity mistake: When the kid rescues Bud from his former owner, Buds paws become all muddy when the faucet breaks. In the next scene they are running down the road and Bud's paws are clean.
Other mistake: When Downtown is in the manager's office receiving his punishment (being benched), as he leaves he slams the door on the cinderblock wall. If you look closely, you can see the cinderblock wall sway. (00:26:34)
Continuity mistake: In the locker room scene, Remer and Joe are both naked. When Remer goes to pull Squeak out the drawer, you see him put a robe on, but you also see him wearing underwear. It wouldn't be possible to put on underwear in about 1/2 a second.
Continuity mistake: As mentioned in a previous error, just before Jake is checked into the Surf Hotel, there is a long scrolling shot that illustrates the surroundings of Jake's room in the hotel. In particular, notice that Nathan's Seafood and Clam Bar is not across the street from Kennedy Fried Chicken. This is contradicted later when a) Jake looks out of his window and sees the Nathan's sign, and b) Jake is seen leaning out of his window above the Kennedy sign.haron
Continuity mistake: In the final lap of the race with Pre vs. Frank Shorter the two runners round the last lap with Shorter leading the race. At first Shorter is leading in lane 1 with Pre following directly behind. Then Pre is suddenly in lane 2. For the final straight away, Shorter is now in lane 2 and Pre in lane 3. (Also a factual error as no runner leading a race would ever run in any lane other than the first which is the shortest distance). (01:36:00)