Did you get stuck in the burger shop and were unable to move, including after the cutscene? Or did it work after the cutscene?
Regarding getting through the mushroom gang
SPOILER
To defeat the mushroom gang, you need to:
Collect items from all available trash cans and containers (they refill within 5 minutes after being opened, if you are at a distance from them).
Throw away all donuts and cherries, since they can explode and drain GUT points.
If you have M, buy lots of Big Garbage Coffee (+50 NRV).
Take a photo.
Go to the mushroom gang with maximum NRV and GUT points (100).
As soon as the encounter starts, choose CLAP and attack only with it. PSYCHO STAR is ineffective in this encounter, it wastes valuable time and NRV points.
Watch your NRV and GUT points, they will constantly drain, GUT in colorful mode, NRV in normal mode.
Don't forget to heal your NRV points, because if you get damage to NRV, then GUT starts to drain regardless of mode.
When you reach the mushroom in the middle, don't hit him until you've healed up.
If you attack the middle mushroom, he will enter a second phase that starts draining your stats at double speed, it's better to attack him while it's in the mode that drains NRV.
Once you've healed up, attack him and start spamming CLAP, and at some point you'll win : ) And don't forget to take another photo. I hope it would help : )
