McDonalds are currently running an ad campaign on UK TV with some fake Teletext pages and they haven't even bothered to get them half right. One of the pages is 53 characters wide, has (at least) two different incorrect fonts, and colours that aren't in the Teletext palette. Also I suspect the "MCTEXT" in the banner isn't possible to do with the control codes but my understanding of those is woeful.
I did think the HH:MM/SS clock was another mistake but that turns out to have been there since 1974 going off stock photos I found.
Yes lots of things in that ad (https://www.youtube.com/watch?v=UJ2z1be2EXQ) are impossible with the UK teletext they're trying to emulate, generated by a Mullard SAA5050 (there were others). It also takes a whole character (for the control code) to switch foreground or background colours. The fonts and graphics pixel sizes are all over the place, the only 'pixel' art available used a 2x3 grid within each character..
I did think the HH:MM/SS clock was another mistake but that turns out to have been there since 1974 going off stock photos I found.