Chandler and Joey's recliners are a darker color than in subsequent episodes.
At the museum, Ross complains that Homo habilis hasn't learned how to use tools yet, when in fact this species of Homo are almost always attributed to stone tools.
Dr Burke does not turn on the light on his device and has shut off the room's lights so there is no way he can accurately see Monica's conjunctives.
When Chandler orders pizza to be delivered, he tells the person on the phone to buzz Rachel and Monica's apartment and they would let them in. However, at this time, Monica was catering a party for Dr. Burke and Rachel was on a date with Ross. Meaning, nobody could have answered.
However, Chandler has long lost track of time and must not have realized that the apartment was going to be empty. He just won't pay tips when the deliver person rings their buzz.
However, Chandler has long lost track of time and must not have realized that the apartment was going to be empty. He just won't pay tips when the deliver person rings their buzz.
The lights illuminating Ross and Rachel are definitely not representing any stars but come from disco ball party lights.
When Richard lets Monica and Phoebe into the apartment, as he's closing the door, you can see down the 'hall' and see that the hallway wall ends and there's equipment visible.
While Ross is rearranging the exhibit, the mic briefly enters the frame, right after he says "just give him a microwave".
At approximately 14:03 as Rachel and Ross enter Joey and Chandler's apartment the shadow of the "boom mic" is clearly visible as it moves along the wall by the front door intercom.
Dr Burke does not turn on the light on his device and has shut off the room's lights so there is no way he can accurately see Monica's conjunctives.
Dr Burke has a beautiful slit lamp on his right and yet he uses his small and inaccurate hand-held light to look at Monica's eyes.
Dr Ross does not realize that bright spots moving so fast on a screen are not depictions of celestial bodies but random disco ball party lights.