I've been keeping a running list of some of the errors I've seen this week.
In the Boys & Girls Clubs of America, there is an S on Clubs. But double-check your local organizations to see which include the S. For example, Dallas has an umbrella organization — the Boys & Girls Clubs of Greater Dallas — that uses the S, but individual clubs don't — the East Dallas Boys & Girls Club.
Fighting on a grand scale is a battle royal, not a battle royale. Etymology here. (And, yes, the French do call a McDonald's Quarter Pounder a Royal (not Royale) with cheese — actually the Royal Cheese.
I've blogged about it before, but here's a reminder: When you get your just deserts, it's spelled with two S's, not three. You're getting what you deserve. (A lot of mentions of just desserts are correct, however; people are punning about recipes or restaurants. But the fact that this pun is so prevalent is in itself a reason not to use it. Cliche watch!)
The pepper is the habanero, not the habañero. No tilde over the N. The etymology should help you remember: It gets its name from Havana (La Habana in Spanish).
And, for good measure, I'll include a link to Skitt's Law.