Revealing mistake: In the second half of his fight with the TVA weaponizing Logan's spoils, Deadpool at one point accidentally stabs himself in one arm using Wolverine's claws. The claws are stuck and hard to pull out, and we are just a few seconds away from a prolonged visual gag based on that concept. However, in this circumstance, the claws come out effortlessly at an impossible angle as he spins away and they do not leave a mark on the suit.
Revealing mistake: When Deadpool dives away from Mr. Paradox and catches his Tempad, he falls towards the employee he has been harassing all along. As the camera closes in to the guy, he is holding a coffee mug, but in the next shot, the mug vanished. This wouldn't be a mistake and is actually a clever hook, since that is the same mug that appears in the intro and the implication is that Deadpool got it at that point in time. However, the implementation seems to be faulty since Deadpool warps away with both arms pointing up, facing away from the guy, who already isn't holding the cup anymore.
Answer: Part of the novelty of knowing that he's in a film means servicing the plot, especially as a proxy for those audience members who may not be as familiar with some characters. Deadpool also does seem to know who Elektra is, as he apologises to her upon hearing about Daredevil's death, even though he just met her moments earlier.
Phaneron ★