Continuity: In this episode Rachel calls Joshua, Josh. But in "The One with Joey's Dirty Day" she says she doesn't like the name Josh, she likes Joshua.
Note: Actually, Rachel never calls him Josh. When going on about how much she loves his name, at one point she says dramatically, "Josh... oo-ah!", but since there is a pause after "Josh", one might think that's all she called him. She does this three times, and the last time, the "oo-ah" is barely audible, but she says it.