Invitation - Flirt with me by being pedantic

At the request of rochvelleth, I put a call out for people who like flirting via pendanticism; it had not previously occured to me other such people might exist. I have permission to quote her: "The morphology of plural endings is just so fascinatingly sexy, isn't it? ::flutters eyelashes::"

<Simpsons>Rochvelleth, your etymolgy is showing!</Simpsons>

Edith, does your name's gender differ from its sex, or are you just pleased to see me?

Spot the deliberate mistakes in this post.