I'm okay with it. I'd also be fine if he wasn't invited back. While an error there means missing out on something extra, it's still a pretty long shot in the Bonus Round (depending on the category & letter selection). I have to go back for a more concrete opinion, but I pretty much lean toward not bringing him back but maybe giving him a $39,000 consolation prize. On certain days, his outcome could be enough to win and on other days, the "correct prize" may not have any barring toward the placements (and a second place finish).
Again, I have to check back to last year, but I think there were several opportunities to win the main game, as is the case all the time. However, that was nice for him to be brought back as it was their error, not his. As mentioned, anything trip should have worked, so maybe they were being too lenient, but such is life.
As for the Wild Card & MDW, looks like the streak of the former came to an end, and go figure, the contestant didn't need it on her way toward solving the puzzle. For me, everyone over the past week had a wild card, not much success; Friday's YOU SHOULD BE PROUD puzzle was a lot easier to figure out than if I had been on stage myself. I may have gotten it right if given 20-30 seconds for the victory
