What are the positions "CA", "TK", and "AP"?
I didn't know about kowabon, but In general.

CA: Camera assistant.
TK: Time keeper. (who check length of script that match to scene.)
AP: Assistant producer.  

Evidence:
CA is positioned next to カメラマン"Camera Man".
TK is positioned next to 音声"Voice"
AP is positioned to last.