I've just found a plothole in OotP. Yes, another one.
It's in Chapter 28, "Snape's Worst Memory."
The Marauders and Snape have just taken their DADA O.W.L. As MWPP leave the classroom and emerge into the entrance hall (with Snape right behind them, apparently absorbed in his examination questions), we get this conversation:
"Did you like
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