Ellie has a flat stomach in this episode, but the previous episode she had a noticeable baby bump.
It is physically impossible to open the emergency exit of an aircraft in mid-flight--pressure differences mean that the door is cemented in place for the duration of the flight, and no amount of force achievable by human beings can so much as budge it. The scene where Tuttle and Chuck open said exit and jump out with their parachutes is thus likewise impossible.
In the back of the truck with the sheep, there is a sheep with horns, then it disappears between shots.