(at around 30 mins) When the scientist is explaining the time travel to Héctor, he draws a Z shape with arrow and two Xs on the back of a calendar. The drawing changes between cuts.
(at around 30 mins) When the scientist is explaining the time travel to Héctor, he grabs the coffee from the machine. When he does so, a hatch opens and you can clearly see a background or mirror of crew members and equipment.
It was said at first that the coffee table couldn't go inside like Hector said but somehow the table reappears when Hector 3 throws from upstairs towards Hector 2