Continuity mistake: As "The Fall" musical sequence begins, Sonny is seen skating along the Venice beach sidewalk. As he approaches the viewer we see people him around dressed in summer clothes and heat waves shimmer off the ground. Then in another cut the people on the sidewalk are now wearing long pants, heavy coats, and sweaters. It is also very windy. Then it cuts back to a summer shot again, and then for the last shots where Sonny discovers the Muse painting it's winter yet again. Obviously this scene was edited together from footage shot in two different seasons. (01:11:25)
Continuity mistake: During the scene where Sonny is chasing Kira to find out who she is, he asks two girls if he can borrow their moped. The scene goes from a sunny day to a rainy day within a couple of minutes. Then Danny shows up on the pier where Sonny falls into the water, almost as if he were waiting there for him. Sonny left him on the beach and chased after Kira - there is no way Danny could have gotten to the pier, much less knew where he was going. (00:14:00)
Audio problem: The tap dancing sounds during "Whenever You're Away From Me" are out of sync with their visual tapping.
Continuity mistake: When Sonny first sees the auditorium that eventually becomes Xanadu, the letters on the roof of the building that spell out auditorium are missing the A and R. Later when Kira takes him to the auditorium, the T is now missing. The following scene when Sonny and Danny arrive at the auditorium, the T is back. Finally, when Sonny and Kira are slow dancing in front of the auditorium before it magically transforms into the finished Xanadu exterior, the T is missing again. (00:16:30 - 01:03:10)
Audio problem: In "Dancin'" when we see the keyboard player playing, the audio doesn't match to what he plays.