Jimmy Kimmel Was Not Pleased with Courteney Cox's Performance in His Friends Reunion Skit

09/23/2014 AT 09:55 AM EDT

Remember that Friends reunion Jimmy Kimmel hosted on his show a little while back? Do you remember each and every mistake?

Well, Kimmel does.

Courteney Cox was a guest on the show Monday night, and the actress's performance during her last appearance apparently wasn't up to snuff for Jimmy.

See, when reviewing Cox's performance during the skit, he noted that, after a line that references the Friends theme, Cox clapped five times instead of the requisite four. Obviously, he was not thrilled about this, and had Cox rectify her mistake on-air. (This time, she nailed it.)

The very first episode of Friends hit the airwaves 20 years ago Monday. One of the details Cox shared during her interview with Kimmel was that she's still a little bitter Monica's haircut never got the same amount of attention that Jennifer Aniston's "Rachel" cut did, particularly since the duo had the same hairdresser – Chris McMillan.

Check out the full clip from Cox's "Clap-gate" below.

RELATED: Friends Turns 20: Celebrate with These Amazingly Awkward Season 1 Cast Photos

Friends cast season 1, 1994

eisig & Taylor / NBC / NBCU Photo Bank / Getty