Eric isn’t in the previews (see here) for tonight’s Wilfred, but based on the tweets from the director a few months ago, he should appear in one of the two episodes that air tonight, starting at 10 pm.
“Compassion / Isolation” Episode 9 – Ryan’s resentment of his eccentric mother is exacerbated when Wilfred starts treating her like the mum he never had.
“Isolation” Episode 10 – Wilfred uses Ryan’s unhealthy habit of isolating as a means to rid himself of a neighborhood pest.
Eric has definitely filmed an episode of Wilfred. Victor Nelli, who has directed several episodes of the show in the last couple of weeks, mentioned working with him on Twitter (link). Since one of those episodes was episode 9 (pic), we probably won’t see Eric’s ep until late August.
In the meantime, here is another sneak peek from Glee: