The habit, the nun is wearing at the end changes color between shots.
Walter tells Paige to say to her son that Orion's belt forms a perfect tangent with the curvature of the moon. The moon never passes through Orion, so it can never form a tangent with the belt.
When the team is having barbecue on the roof, Cabe is playing chess with Ralph. However, it can be seen from two separate angles that Cabe has two Kings side by side with identical crowns. There is only one King per side in Chess.
Toby and Happy use the truck to ram into the employee's car in the parking garage visibly showing damage to both vehicles. However, when Sylvester runs out of the building via a side entrance and Toby places a latching cord on the door, you can see Happy driving the same truck with no visible damage to the front end.
Walter says "trigonomic functions" when he actually meant trigonometric functions.
In the first few minutes when Walter is reading the letter about Megan's deterioration with her MS, one line in the letter reads, "...rapidly advancing as her disease. Nor, have I scene...". The word scene should be seen.