Pet peeves (beware some RotE spoilers)

[Albertosaurus Rex]

I personally think that firebreathing is cool enough to not worry about the scientific repercussions, although I do agree about wing span. I think that GRRM's take on dragons is the best I've seen so far, although dragons being hermaphroditic is a bit... odd.

And here's the big one that I somehow forgot. I can deal with the other ones, but this one makes me bang my head against the wall in frustration:

The time travel episode in a series not focused on time travel

Long-running fantasy and SF shows have a tendency to throw in a time travel episode sooner or later. Now, I don't hate time travel, but if you stick it in your story, you better make it the central component of your story.
We humans tend to live our lives as a straight line. We can never change our past decisions, so we have to accept the consequences of our actions and come to terms with the past. Time travel turns this idea on its head. Therefore, it is very jarring to see it pop up once... and then never coming up again.

Charmed has one of the worst examples.

On multiple occasions, time travel rears its ugly head. In one notable instance, the sisters reverse time to save Piper's life, although Prue dies in the new timeline. Later, a season-long story arc revolves around Chris, Piper and Leo's son from the furure, traveling back in time to prevent Paige's death and his brother Wyatt's turn to evil. Bear in mind this is not repairing the timeline - the oppressive future Chris comes from is the original, unaltered timeline. And he actually succeeds in his efforts!
Then, in the abysmally bad final season, Billie is introduced, and she's searching for her sister who was abducted as a child. After some fruitless efforts, Phoebe tells her to her face that she has to accept the past because it can't be changed. And she says this, even though she was perfectly happy to muck around with the timeline in the previous cases that I mentioned. It's stuff like this that I can't stand.

Star Trek, Charmed, Babylon 5, Harry Potter, Gargoyles and many more have committed this sin and I hate it. It's the moment in an otherwise good story that makes me cringe.

And one more to finish the list:

That episode that every cartoon show must apparently have in which the characters are shrunken down and pilot a tiny submarine into someone's body

Because it's gross, not funny and done a million times before.