Andrew: So the majority of this is actually shot in separation, where you don’t see Castle and Beckett with the tiger in the same frame very often, so Nathan and Stana were not in any danger from the tigers through most of this. Hem…except when they went in there and tried to pet the tigers…Stana?
Stana: I don’t know who you’ re talking about.
Nathan: Tigers made my list. Bears, sharks, tigers.
(Andrew Marlowe, Stana Katic, and Nathan Fillion episode commentary)