I could watch these episodes forever. I love Tim Schafer... <3
In terms of difficulty I saw other people bickering about; Tim is right, the difficulty is fine. The days of being able to spend 4 hours stuck on one single puzzle in a game are in the past. If you make a game too hard, people will not keep trying like they would have 15 years ago, they'll either A. give up, or B. Google a walkthrough, which makes the game less enjoyable.
The reason puzzles used to be more difficult was either A. they didn't make logical sense (Monkeywrench!), or B. the objects you needed for the puzzles were one pixel somewhere hidden on the screen.
Now I know I'm painting this in black and white, and there are at least 50 shades of grey, but for the most part, I side with the developer.