In the previous episode, Joshua said good-bye to Rachel, indicated he was through shopping until perhaps spring. But he's right back in this one, as if there was no break in his customer relationship with Rachel.
When Chandler and the girls are in the strip club, one of the strippers kneels down and has no top on. When Rachel enters the scene, there is a quick camera edit and when the stripper kneels down again she is wearing a silver bra.
When Charlton Heston is pointing at Joey when he finishes admonishing him not to ever use his shower again, one camera angle shows Heston using his left hand, and another camera angle shows him using his right hand. Also, the camera angles change rapidly, showing Heston first pointing with his right hand, then left, then right, then left again - all in rapid succession. This is a case of extreme carelessness on the part of Heston, as well as the director, camera guys who shot at the second angle, and the folks that spliced the two different camera shots into one scene.
The female that claimed to be "Rachel Greep" would have to have shown ID in order to be let into the club that Joshua invested in.
Joey has scruff returning from his fishing trip when he had not showered in 3 days. He supposedly goes to bed without showering and overslept but is clean shaven on the set the next day.
After Charlton Heston warns Joey not to use his shower, it cuts to a shot of Joey and Heston can be seen pointing and saying some further for a second, but no words are heard coming from his mouth. Until it immediately cuts back to Heston and he says, "Do you understand me?"
In the opening scene when Joey and Ross are talking to the girls about taking Chandler to a strip club, a blurry crew member can be seen moving in the reflection of a window.
When Joey wakes up and is late for his call time, he says he has to run 10 blocks to get to the studio. In the next scene, the establishing shot shows the front of Silvercup Studios which is based in Queens. Being that the village is in downtown Manhattan, it is impossible for the studio to be only 10 blocks away.
Rachel comes home from work and asks her friends to take her place going to the opera with Emily. Monica says she can't, because she has to work that night. Based on events in the scene, it has to be 6 PM or later, and a dinner chef would have been at her restaurant for hours by then.
Showering wouldn't have entirely removed Joey's odor because it would still be on his clothing, he would have to wear after showering.