No drink is poured after finishing a glass (21:30) and yet the glass is full again at (22:15)
At 22:25 there are no glasses visible on the table which they have been drinking from (the main point of the table scene)
At 22:50 the third man is not given an onion and yet he eats one with the other two characters.
In reality it would not be possible to fit that many musical instruments AND five people into a Citroen Dyanne.