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.
Continuity mistake: After Collins gets the keys in the street he is asked for a light. Another guy comes up and grabs his bag. Collins pushes him and runs. The bag is on the ground and one of the people attacking him picks it up. In the next shot Collins is running with his bag back in his arm. (00:06:30)
Answer: "This egg needs some salt." It's a Spanish idiom meaning that he needs a girlfriend.