Continuity: Carla and Turk's song and dance, "For The Last Time I'm Dominican", was filmed a couple of months later than the rest of the episode because actress Judy Reyes, who plays Carla, was recovering from a broken hip at the original time of shooting. Stephanie D'Abruzzo, who played the patient, was brought back in to film the scene; her hair is noticeably longer during the "Dominican" song than during the rest of the episode.
Great sites
Quotes
Dr. Cox: Hey, Betty. Hey, Wilma. Oh, what the hell, you're only forty minutes late. Do I... do I smell beer?
JD: Uh, we... uh, we had a few.
Dr. Cox: Newsflash, you can't drink and then come to work. You're not airline pilots.
Trivia
The initial concept for the janitor was that he was only in J.D.'s imagination. If you watch the early episodes, the janitor doesn't interact with any of the other characters. The idea was eventually abandoned because the character became too popular. See more...
Scrubs (2001) - 1 mistake in "My Musical"
starring Donald Faison, John C. McGinley, Judy Reyes, Ken Jenkins, Neil Flynn, Sarah Chalke, Zach Braff (add more)
Updates: 
Series 6
My Musical (season 6, episode 6)
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