In an earlier episode where all the friends gather around to watch the Prom video, Chandler makes some flippant comments upon seeing Monica in the Prom video, suggesting that he's never seen the fat Monica before. However, there are future episodes showing flashbacks of Chandler with a fat Monica together in college.
After the television turns off you can see Monica's reflection in the television of her beginning to rise onto her knees, in the next shot she's sitting and again starts to rise.
On Chandler and Joey's first foosball table there is a plastic/glass covering over the table that appears occasionally, but the majority of the time it's not there. However, when Chandler and Joey broke their dining room table the bought the foosball table to replace it. They sometimes use the clear covering so they can actually use the foosball table for eating. Then they remove the clear table top to play the game.
When Phoebe tells Chandler that a woman is checking him out "at 11 o'clock" the positioning is actually 5 o'clock.
In the end, Chandler and Joey have matching gaudy gold bracelets, which are intended to be worn all the time as a symbol of their being "best buds." The bracelets are never seen again after this episode.
Phoebe says lobsters mate for life. Lobsters, by nature, are not monogamous and do not pair for life. A dominant male will actually mate with multiple females during encounters that last days to weeks.
Ross is seen in the video running around the corner in slow motion prior Ross in Monica's apartment asking the gang to switch off the television.