I was surprised by the presence of a second pair of the same green boots in a secret area. Well, I also never figured out the remaining hidden things - a) you can see from the secret area that something is there, but I couldn't find how to get to it; b) what's up with the cross at the culturologist's; c) is fixing the light bulb possible or is that a joke?
But I thoroughly enjoyed the map, I recommend it. It's nice that even regular players can play through it on a hero - besides the finale and starting money from the level, nothing really depends on it.