Continuity mistake: In the scene where the social worker is at Mr. Hillard's house and his so-called "sister" (Mrs. Doubtfire) is trying to find a face in the kitchen, one moment the wig is all messed up from being caught on the door. In the next scene, where she is looking in the fridge to find the face, her wig is perfectly in place.
Continuity mistake: At the end when the children learn that their dad is their new baby sitter, look at Chris' tassels on his coat from when they get to door to when Daniel says 'Go get your stuff' and he runs up stairs - between shots, his tassels are both hanging down, then hanging to the right, then hanging down etc. indicating this scene was shot at least twice.
Audio problem: During the final court case scene at the end of the film, Miranda's lawyer turns to her and says, 'Congratulations'. The lawyer's head is turned away from our view slightly, but you can see that she doesn't move her mouth. It does move about a second after 'Congratulations' is said, but it does not move long enough for the lawyer to have actually said 'Congratulations'.
Continuity mistake: When Chris and Lydia discover that Mrs. Doubtfire is really their father, he explains Uncle Frank's and Aunt Jack's part in it. When it cuts back to Lydia, she has a long length of hair down the front of her right shoulder, but in the next shot, when she says, "It's really you in there," the hair is suddenly behind her shoulder.
Continuity mistake: In the scene in the kitchen while Daniel is looking for a face, his robe is not closed completely at the top, but as soon as Mrs. Stelner enters, the robe is done all the way up and quite tightly. After the face cream in the coffee, Mrs. Doubtfire leaves but quickly sticks her head back in the kitchen and her robe is again loose at the top.
Continuity mistake: When Daniel is in the bathtub, speaking in a German accent while on the phone with Miranda, he asks her how many children she has. At this point Daniel's chest is clean. It then cuts to Miranda who says, "I have two girls and a boy." In the next shot, however, Daniel's chest is suddenly covered in bubbles.
Other mistake: When Chris sees Mrs. Doubtfire in the bathroom she is standing up and peeing, in costume. All the scenes where Daniel is putting the costume on shows that the fat suit is a body suit, in one piece, and there's no opening in the front. So he shouldn't have been able to pee without taking off the whole suit.
Other mistake: At the start of the film we see Gloria Chaney, the Hillards' neighbour, drop a rabbit at her feet and then shout 'shoo' at it whilst pushing it with a brush. If she had it in her hands, why didn't she just drop it outside of her garden, instead of at her feet, making her have to push it to get it out of her garden?