Now this is a classic GMing mistake.
Some player or other is always going to remember a tiny detail that you'd thought they'd all safely forgotten. This is the exact complement to the fact that any incredibly important plot point that you've carefully revealed to them will be completely forgotten.
GM: Obi-Wan, you're suspended in an energy matrix.
Obi-Wan: I try to escape.
GM: You can't move at all.
Obi-Wan: Oh. So I'm just here to listen.
Count Dookû: Sacrebleu. Obi-Wan Kenobi.
Obi-Wan: How do you know me?
Count Dookû: You are ze killair of Darth Maul, are you not? Your femme precedes you.
Obi-Wan: And you are Le Comte Dookû. Leader of the Separatist Alliance. Enemy of the Republic.
Count Dookû: 'ow do you know Ah am ze leader of ze Separatists?
Obi-Wan: I thought it was common knowledge.
R2-D2: It is?
Obi-Wan: It was part of the adventure background! We heard it at the beginning.
GM: You paid attention to the background??
Obi-Wan: I know that normally that's a good way to keep something secret, but this is me you're reckoning with.