CONTINUITY errors in Friends episodes aren’t a new thing.

Outlooks from apartment windows, character backstories, ages and even actual birth dates regularly change throughout the 10 seasons, with fans quick to pick up the mistakes.

And we can now add one more to the pile.

As Popsugar points out, Monica’s apartment number has the unusual ability to change.

For the first few episodes in season one, Joey and Chandler live in apartment four while Monica lives in apartment five.

Apparently, someone was quick to point out they all lived a bit too high up for those numbers to make sense, and they were quickly renumbered to 19 and 20.

Want receipts with that?

Check out the screenshot below.