John Roger's comment on the trailer is:
There is so much fun here. And spoiler, it is NOT R.I.Z. that all the crew members are afraid of …

So, who is it? Place your bets!

We also have an article with some comments from Christian Kane on the episode with James Marsters.

“We may have dropped a couple of Easter eggs in there for the [Angel] fans, man, to be honest with you…,” Kane teased for TVLine.

...

“You’re always looking for Spike to go after Lindsey, and vice versa. We were always trying to kill each other,” he noted of the Angel duo’s dynamic. “And we did that this time really, really subtly, with different hats on.”