---Great Exchange:
Monica: So, maybe I am a little high maintenance. And maybe Rachel is a little bit of a pushover. But you know what we decided you are?
Rachel: “Yes, we are very sorry to tell you this, but you, Phoebe, are flaky.”
Monica: “Hah!”
Phoebe: “That's true, I am flaky.”
Rachel: “So, what, you're just... you're just okay with being flaky?”
Phoebe: “Yeah, totally.”
Monica: “Well, then, I'm okay with being high maintenance.”
Rachel: “Yeah, and I am okay with being a pushover.”
Phoebe: “That's great. Good for you guys.”
Monica: “I am not high maintenance!”
Rachel: “I am not a pushover!”
Phoebe: “Who said you were?”
Monica and Rachel: “You did!”
Phoebe: “Oh, I'm flaky. I'll say anything.”

When Ross shows Gunther the joke in Playboy, Gunther looks at it for about one second before giggling and saying that it’s funny. Just how short is that joke? Even a brief "What do you call..." type joke takes longer to read.

When Gunther offers Joey a job as a waiter, he says the money’s “great,” and in the beginning of Act 2, Chandler says he thinks it’s great that Joey is working at Central Perk, giving as one of his reasons the fact that he’s gonna make a lot of money. Huh? Since when? When Rachel got her first check in The One With George Stephanopoulos(1.4), it was made clear that that job paid lousily.

Trying to convince Monica near the end of the episode that he came up with the monkey joke that Playboy published, Ross points out that he’s a paleontologist, adding, “Ya know, “monkey into man”? Um, Ross? Man didn’t come from monkeys. You’d think a paleontologist would know that.

Even professionals slip sometimes, especially when talking to "normal people" . I do it myself sometimes with scientific jargon. I think it's the same thing as Ross alternately saying Jurassic Park is implausible and him pretending to have come up with the idea for it: privately he's very punctilious about getting everything just correct, but in public he's willing to fudge it (especially in this case when he's using it to justify a point).

Why in the world would Gunther leave an employee who's been working at Central Perk in charge of the place when going out on an errand? Is Joey the only employee at Central Perk, given the size of that place? Wouldn't the other employees have gotten that job out of seniority? Wouldn't they have stopped Joey from closing the place?