On the computer console in the room where Dr. Banner is being held prisoner, the same red button is used to perform many different operations (in one scene it fills Banner's chamber with gas, while in another it drains the gas from the chamber.)
When T'Challa is standing outside on the balcony of the castle, just after being exiled, he isn't wearing the Black Panther costume, then you see the aliens for a second or two, then switches back to T'Challa pulling on the Black Panther hood, and wearing the rest of the of the costume. How did he get the costume on so fast?
When Iron Man is being helped into the avengers airship after the locals hit him with a large log, his armor is visibly damaged. Next time you see him, he is closing the door and his armor is whole. Then the next time you see him, his armor is damaged again!