This is how it looked to me: Aside from being dressed as Beatles from different eras, you have two John Lennons: 1964/65 John (moptop) and 1969 Abbey Road John. Paul and George have been fused as one Beatle! In appearance, it is Abbey Road George with the hair and beard. But, he is dressed in Paul's suit from early 1969 from the Apple rooftop concert and playing Paul's Hofner bass. I think the writers were having a little fun by mixing things up on their appearance. If you do the math, you have 1 ringo, 1 George/ Paul fusion (or half-George, half-Paul), and 2 Johns! LOL
"Excuse me, do you mind not farting while I'm saving the world?" -The 9th Doctor, DOCTOR WHO episode "World War Three"