Commissioner Gordon tells Batman he hasn't decided whether or not to put Professor McElroy on trial for his crimes as King Tut. He should have said he hadn't decided whether or not to press charges - it is up to the district attorney and the judge to decide whether to bring the charges to trial, not the police commissioner.
In order to protect himself from Tut's Ab Rabu Simbu Tu serum, Batman coats his stomach with buttermilk; however as he's drinking each glass of buttermilk, the residual coating on the inside of the glass is smooth and evenly spread. If he were drinking real buttermilk, the residual coating would've been in noticeable streaks on the inside of the glass.
As he is being led away, Professor McElroy (King Tut) shouts that "The PTA shall hear of this!" The Parent-Teacher Association (PTA) is a feature of grade schools, where the students are minors overseen by their parents. Universities such as Yale do not have parent-teacher associations, as their students are independent adults.
The close-up shots of real crocodiles put them in deeper water than the wide overhead shots of Tut's "crocodiles" do.
When Batman climbs up the outside of the Gizeh Gardens to rescue Robin from the Tank Room, the wall shakes as he grabs the bars over the window.
Why would Batman not give Robin buttermilk, too? If the six glasses of buttermilk could've overcome Tut's toxin, it would be beneficial to inoculate Robin in case someone tried to poison him as well.