Continuity mistake: The first time we see Robert with the arguing couple, the woman puts her finger to the side of her head in a side-on shot of her, and in the next (a more front-on shot) her hand is suddenly on the table.
Continuity mistake: When Giselle opens the window in Robert's apartment, in the exterior shot, to sing for furry cleaning help, there is a set of three windows to her right, with a balcony. Odd thing is, in the interior shots the window she sang from is to the left of the couch, but to the right of the couch there are three French doors, not windows, that open to the balcony.
Visible crew/equipment: At Robert's apartment, when he and Morgan stand by the window just as Edward takes Giselle's hands and later kneels, the actors' two T-marks are visible. The pink marker was for Giselle in the previous shots, and Robert and Morgan stand behind the orange marker. (Only visible on fullscreen DVD.)
Continuity mistake: When Giselle tosses the sword and the tip catches Robert's sleeve below the cuff, in the following shots the position of its point through the sleeve keeps differing. Then, after Robert loses his grip and Giselle breaks his fall, as they both start to slide Robert's sleeve is intact, but in the next shot the entire sleeve suddenly disappears.
Other mistake: In his search of Giselle, when Edward knocks on doors 209 (hissing cat), 405 (barking dog), and 714 (purple guy), the funny thing is that in all three close-ups the three door jambs/trim have the same paint glob markings. The actual doors were changed, but the jamb/trim remained the same for all three shots. (Only visible on widescreen DVD).
Continuity mistake: During the cleanup, when Giselle opens the center French doors and stands on the balcony to sing, the window she sang from earlier is directly beside the balcony, to the right. The problem here is, in the interior shots there is a wall that is about 7-8 ft wide, between the French doors and window, where the couch is.
Continuity mistake: When Robert gets up in the morning to deal with the pest problem he has facial stubble, but when he gets outside after chasing Nancy in his pyjamas, he is nearly clean shaven. When he goes back to the apartment his heavy stubble is back again.
Continuity mistake: As Robert drops from the bent spike, he hits the roof and both he and Giselle are sliding down the side of it. In the shot viewing from above Robert can be seen reaching some kind of ledge on the roof, while Giselle is 1-2 meters above him, also sliding towards the ledge. In the next two shoots (1st from the side, 2nd from below of them) both of them are still sliding down the roof with the ledge no where to be seen.
Continuity mistake: During her first morning at Robert's apartment, Giselle has made a gown out of the living room draperies, but the remaining drapes on the windows are a very faded turquoise floral and the color of Giselle's dress material is a bright turquoise floral, which is actually more similar in color to the lamp on the table.
Continuity mistake: When Robert and Giselle are at Bella Notte's, there is a red checkered tablecloth on the table. The direction of the broad red lines changes between shots, in Chip's close-up when he stands on Gabrielle's plate. First it's horizontal, then vertical - note the knife and fork.
Revealing mistake: The first morning, when Robert takes Giselle to work, they enter atrium of the Time Warner Center (the well-known statue of the female Giselle admires is one of a set, the other is male), which is located at 8th Ave and Broadway, at the southwest corner of Central Park. Upstairs, when Sam tells Robert that she can't find where Giselle is from, and then when Giselle speaks to Phoebe, the very distinctive Johnson Lipstick Building (it's reddish and has three receding oval-shaped levels) at 53rd and 3rd is seen outside the window. The office scene is obviously not filmed at Time Warner, because it's impossible to be in an office at 8th and Broadway, on the West Side, and be next door to a building located at 53rd and 3rd, on the East Side.