Anachronism Stew: According to him, Food was invented when some guy got bored killing kittens for lulz and ate one, England is cast in total darkness every so often, there is a 87 foot lemur (which is really a whole bunch of lemurs) in the countryside, and goats are the dominant species.
Berserk Button: While not in a rage, he's obviously displeased when an infomercial product add-on to shred cheese just destroys it instead. Given that almost all the food-related commercials showcase his love of cheese, you can see why.
Black Comedy Rape: During his Butterfly Effect 3 review, two characters in the film are taking part in a rape fantasy but the man decides it's too much for him and stops, annoying the woman. MikeJ comments that he didn't know women were into that sort of thing, so he goes off-screen and all that's heard is a woman screaming. MikeJ returns to his chair and continues the review.
He jokes about him and his sister having children.
In the Catwoman review, he learns that it isn't his.
Really, it's a bit of a Running Gag. Apparently, it applies to all British people, as seen in the Halloween 2 review, where special guest star Welshy proved his British-ness by claiming to have had sex with his sister, a sheep, and cheese on toast.
Fake Brit: invoked Subverted in his Baby Geniuses 3 review when an actor puts on a terrible British accent and when Mike checks IMDb to find out his real nationality he's shocked to find out the actor actually is British.
Mental World: He goes to one containing versions of the other British critics when he reviews The Matrix Revolutions. If he doesn't complete the review in time, something terrible will happen to him in real life.
Separated by a Common Language: The title of his show Asylum Seeker is a pun based on it being about him looking for good parts in the films of The Asylum, while the phrase "asylum seeker" is often (and stereotypically) used by British Newspapers hostile to immigration about immigrants seeking political asylum. Foreign viewers may not get the reference.
He also made a Music Video about common words that are different in American and British English.