I have found 3 so far.

1: The semicolon

2: The Scratch Wiki opening

3: The Scratch Wiki COMPLETE CHAOS

But what are some more pranks besides those?

Fake “Griffpatch is now following you” messages

Also normal Scratch Wiki pages are replaced by joke versions, like https://en.scratch-wiki.info/wiki/()_Mod_()

The new SDS, but that's about it.

I did not get the griffpatch is following you

SuperMarioBrosLover wrote:

I did not get the griffpatch is following you

It only happens to some people somehow. I didn't get it either.

griffpatch likes to take some of his followers and prank them from saying he followed them but he didn´t. I was actually one of these people.

everybody820 wrote:

griffpatch likes to take some of his followers and prank them from saying he followed them but he didn´t. I was actually one of these people.

It was a prank that griffpatch wasn't involved in, if you check his profile you'll see it doesn't say he followed anyone. You can also check your messages for the griffpatch message, instead it'll say “attentionseeker009”.

is there any actual proof that the griffpatch following thing is real?

cloverfly wrote:

is there any actual proof that the griffpatch following thing is real?

There is a video of it but some how the notification has been changed to (attentionseeker followed you)