Before the controlled detonation of the school, a blue smoke marker is launched. Immediately after the detonation of the school, there is no blue smoke.
At 24:51 Corporal Garza is seen wearing his motorcycle helmet that he found to replace his original helmet that he lost in episode 3. However, at 24:54 in the very next shot, we see him putting on his old helmet again.
At the 59:26 mark, it is visible that the dead guy "a hajis" on the ground is seen moving his hand. This is right after Lance Cpl. Trombley says, "hajis gotta learn."