Alara's bag is missing from the ground when her parents help her inside their home.
Gravity is a universal constant. Alara's planet's ocean waves react the same as they would on Earth, which is inconsistent with the concept of the planet's super-normal gravity.
The Kitans' flying vehicle does not have a reflection on the water as it flies out to the island.
When Alara and Isaac arm wrestle, a zipper can briefly be seen on Isaac's right arm.
At the very beginning of the episode, Dr. Finn informs Alara that her muscle mass has deteriorated by 20%, to which Alara reacts with shock. That would be a massive drop in her ability to function. She should have noticed such a large drop in muscle mass (or the writers should have picked a smaller, more believable percentage of deterioration).
Due to high normal gravity, Alara has trouble using her legs, but can hold her head up, breath and use her arms without difficulty. In fact at one point, she easily lifts her leg with her hands.
After speaking to the interim security chief in Ed's office, Kelly offers to show him to the bridge. The bridge is just a few feet from Ed's office. He would have been able to see it on his way in.
When Bortus asks Tharl, "What is that?" Tharl mistakenly believes Bortus is asking about his lunch and says that it is stew. It is very clearly a salad.