When Howard is talking to Yanek, there is a hanging scale behind him,between him and the door, and the position of the needle changes position between shots.
Peter is holding his fork American style supported on his second finger with the tines facing up, then in the next shot he is holding it British style gripped with his thumb and pointing finger with the tines down, then American style again supported by his ring finger. That is three different positions in three shots all in a matter of a few seconds.
Howard corrects Emily's pronunciation of patronizing, but she is using the British pronunciation and his is the American pronunciation so she is not wrong since her accent is clearly British.
Echo is used to extract vital information about important people to be used against their others on Earth one. However, on Earth one, Marceau is dead so he should not still be in Echo on Earth two since he is dead on Earth one.