Continuity mistake: In Santa Fe, right after Collins does the forwards/backwards flip, a man can be seen over his shoulder putting on a black hat. The shot then cuts away then cuts back, and the man is once again putting on his black hat which should already be on his head.
Factual error: During a pan over midtown between scenes, the camera shows the Metlife building with the Metlife logo. However, in 1989 the Metlife building still had the Pan-Am logo on it. It was not changed until 1991.
Audio problem: In the scene where Mark throws the keys to Collins the second time, he comes back in the window and we can see Roger sitting on the couch. It appears that Roger is strumming his guitar, but there's no sound from it.
Other mistake: Right before 'La Vie Boheme' in the Life Cafe, just after the host requests that the tables not be moved, Angel says 'Hey ROSIE, let's push these tables together.' Rosie is the name of the actress (Rosario Dawson,) the character's name is Mimi.
Continuity mistake: While Angel is singing "Today 4 U" Roger's hands constantly change where they are tapping and what leg they are holding on to between rapidly changing camera cuts.
Continuity mistake: When Angel is in the hospital and Mimi and Collins are there supporting him, Collins lays the towel down twice onto Angel's forehead.
Continuity mistake: During "I Should Tell You" Roger and Mimi are walking out in the snow. As they walk away from The Life Cafe you can see their footprints in the snow. When they turn to walk back toward the cafe all of their footprints are gone - they are now walking on a fresh blanket of snow.
Continuity mistake: When everyone goes into the diner the entrance/exit is on the left side, but then Roger and Mimi leave on a different side of the building and then come back in on the same side they left originally.
Continuity mistake: When Mark and Roger sing the lines, "You're wasting your time, we're broke. And you broke your word, this is absurd." None of the burning papers from the song "Rent" can be seen on the sidewalk. But before and after this portion of the song, they are visible.
Answer: "This egg needs some salt." It's a Spanish idiom meaning that he needs a girlfriend.