"Comprising" being mistaken for "composing" and used in the in a similar way.
e.g.

"The team comprises of eleven men" rather than "The team is composed of eleven men" or "The team comprises eleven men"

I've even heard the infallible and omniscient Anne (Weakest Link) Robinson use it thus.



THIS IS MY PET HATE:
The use of apostrophes for plurals and, now I'm seeing more and more, third person singular verbs.
e.g.

"Tea's and coffees served all day" (and note it's not consistant. Why should "Tea" have it but not "coffee"?)
"he like's what he sees" (again - inconsistant)

Terry