Continuity mistake: When deeds saves babe from the lake when he punches a hole in the ice the hole is not big enough for her to get out but then it cuts away and back and it is suddenly larger.
Continuity mistake: At the beginning, when Chuck enters the boardroom asking about the heir, Anderson is sitting at the big table, with loads of papers in front of him. A blue pen laying on top of the papers, yet between shots the pen magically moves underneath one of the pieces of paper. (00:03:25)
Continuity mistake: When Adam Sandler beats the supposed mugger, he and Winona Ryder step over the mugger's body, but then stop to talk. The shot then shifts from the two talking (with no one behind them), to the mugger (who is behind them), back to Sandler and Ryder talking again (with no one behind them).
Continuity mistake: In the Pizza shop, When Pam kicks Jan in the stomach, Jan goes flying and hits a table, and then slides off the table on the floor. In the following closeup, Jan is lying on the table, and pieces of broken wood also appear around her which weren't previously there. (01:11:30)
Factual error: At the start of the film, in the shots with Mount Everest, climbers aren't clipped onto fixed ropes. On all the biggest peaks on the planet, climbers will always used ropes fixed onto the mountain, and because they are attached to it, it can stop a fall. But in Mr. Deeds, this doesn't happen. (00:01:20)
Continuity mistake: During the apartment fire scene, when Deeds and the woman bounce on the catcher, they bounce back up - but it was just a rewind of the way down. (00:51:05)
Continuity mistake: In the big meeting at the end, Babe (Pam) runs in, carrying some files and Preston Blake's diary. She is holding some files, and the blue file is showing. Yet moments later, between shots, the blue file jumps into the middle of the files, and now the white files are showing. (01:21:05)
Continuity mistake: When Deeds enters Madison Square Garden, he walks past two chefs who have a food trolley in front of them. One of the chefs lifts the lid of the trolley to reveal chicken parmesan. But as the chef lifts the lid, between shots it switches from him opening it with his right hand to his left hand. Also when it switches to him opening it with his left hand, he also acquires a silk handkerchief in his hand too. (01:04:35)
Continuity mistake: When Deeds enters the basketball stadium, where the romantic dinner is being held (prior to the rehersal), he walks into the stadium twice. You see him walking in down the entrance, past the chairs, then you see him fully walk onto the basketball court. In the next shot, he is still walking down the entrance, past the chairs. You can also tell, because he walks past the old man twice. (01:04:25)