Elliot says she "might need a vagina transplant". Later in the series we find out that Elliot cannot say "vagina" but says "bajingo" instead.
JD pronounces "bradycardic" as "BRAD-ee-card-ik" instead of the correct "BRAY-dee-card-ik"
After sleeping with Elliot, JD says that he was stuck on 4 since med-school, when in fact he slept with Jordan in "My Bad" (Season 1 Episode 6)