When the BAU is addressing the police department, Reid is standing against the wall with his arms crossed. Immediately afterward, his hands are in his pockets and you see him crossing his arms again.
At 22:21- The truck headlights are taped over to reduce glare.
When Reid and Gideon are addressing starting a curfew (around 10:40), you can see the spike tape for the actors' marks on the floor.
At about 14:52 JJ says she has a niece the same age as the child she's speaking too. However, in later seasons we learn JJ's sister committed suicide when JJ was a child and no children were ever mentioned. There were no other indications the JJ had other siblings.