When the gang first meets the Interpol agent, she says that they're starting to get a reputation. After Happy asks, "A good one?", she's (Happy) holding a paper in her hand. In the next shot, it's gone.
During the robbing of the armor car, 5 incendiary bombs are tossed into the truck. 2 in the cab and 3 into the rear of the truck. Only one goes off in the cab and only 2 go off in the rear.
When the team goes to the hospital to visit Sylvester, Toby pulls comic books out of a box and places them on the tray table and the box is placed on the floor. In a following scene, the box is on the table and no comic books are seen. When Walter asks his brain teaser, the books are back on the table in their stacks and the box is gone.
In the early scene in the office, Sylvester has a calculator on his desk.
He is a mathematical genius who can perform complex calculations in his mind.
If this were a scientific calculator it could be argued he does not memorise the Sin, Cos or Tan of every number, for example, but this particular calculator is just a normal desktop commercial calculator used for arithmetic.
This suggests it is just a prop placed on the table to show he is 'The Maths Guy' by a prop master who does not understand the difference between different types of calculators.
When Sylvester has a seizure in the hospital, Megan jumps out of the chair and stands unaided, in the room while staff try to control Sylvester's seizure. Megan who suffers from multiple sclerosis normally struggles to ambulate without crutches.