Starting at 2:13, Cartman is absent from the classroom in order to participate in the morning announcements. Therefore, there should be an empty desk in the classroom where he would normally sit, but no empty desks can be seen.
At the airport, Cartman and the others buy their tickets with Delta, but the plane shown en route to Cairo is in the paint of Southwest Airlines.
After the boys commandeer the yacht, Cartman calls out, "Hard to port lads!" Butters asks, "What's port?", to which Cartman responds, "Just make the boat go that way kind of" and points his cutlass to the right. Port is left (which is easy to remember as both words have four letters.)
Cartman says no Jews are allowed to join them and be pirates, yet he allows Ike, who is Jewish.