Some blatantly false claims are made -- for instance most of these examples do not come coupled with breaking through a barrier to look like The Shining. It's clear this is a Stock Phrase, it just needs to be presented more accurately.
And I'm still convinced the trope name should be Here's Johnny, not Here's X.
I took a stab at re-writing the description (and did a general grammar sweep of the entire page while I was at it). Fixed, or still needs work?
For a trope with a metasyntactical variable in its name, there's not much variance between the examples -- they're all "Here's Johnny". If it's as commonly used for other names as claimed, surely there should be an easy one to find and include in the examples list.
If not, I suggest this be renamed to "Here's Johnny", as that's clearly a trope entirely on its own, as the Know Your Meme page on it demonstrates.