Most of the issues mentioned so far occur in shows which have multiple more serious problems which make them suck, so they don't annoy me all that much.
Ridiculous contrivances, used solely to advance the plot from where it is to where the author wants it to be, because the author is too lazy to create a plausible transition, now those pies me the fuck off because it can ruin an otherwise good show. Almost every significant event in the second half of Code Geass, starting with Euphemia's little brainwashing incident, fits this perfectly.