Visible crew/equipment: S4xE8 "Meet Kevin Johnson": Near the end, Karl has nothing in his left ear when he and Alex sit down and start talking, but when Karl falls onto the ground, the actor has a wireless earwig device in his left ear in his close-up, before Alex turns him over. Then, when Alex sits by the tree distraught, Danielle tries to convince her to listen, and in Alex's extreme close-ups, she has a mini lav mic (similar style to DK3 series) at her right ear that becomes visible.
Continuity mistake: S4xE8 "Meet Kevin Johnson": Near the end, Danielle, Alex, and Karl stop for a couple of minutes to drink water, and when the bullet hits Karl's water bottle, in the close-up we see the low level of water inside the water bottle directly above the leak, but in the next shot there's much more water inside the bottle above the leak.
Answer: He was eating a peice of an orange with the skin still on.
XIII