I think my absolute favorite was Harry Kim never getting promoted (even though everyone around him was) but somehow retaining a critical position on the bridge and the command staff. If he's not worthy of promotion, then bring in someone who is.
How is that a contradication??
I would have voted for Janeway supposedly fiddling with her combadge, but I couldn't have said if that was true or not.
It is. There were plenty of times like that, before and after that episode and she never did it!
I noticed that a lot of examples are more of oddities than contradictions here.