The four spheres that Harry uses to help him "survive" are an homage to the spheres the alien uses in 'Starman.'
Under Max's bed there is a football labeled Sardis which is an ancient city that was first destroyed by an earthquake. It was then rebuilt, then destroyed again by the Turco-Mongul warlord Timur. This mirrors Harry's fears for the earth and everyone living in Patience.
"The rug really tied the room together," was a wink to the Coen brothers film The Big Lebowski.
Under Max's bed is the comic Sonic Universe 11. In it Dr. Finitevus is trying to get the Naster Emerald from Knuckles for it's power. Like how Harry needs his orb back from Max. Knuckles and his team are also trying to save Angel City from destruction.
When Asta threatens to kill herself by dropping plugged in toaster in the bathtub filled with water, she would not be able to do so even if Harry did not unplug the toaster at the last minute. The toaster was plugged into a GFCI outlet. The GFCI would have cut power when Asta stepped into the water. At very least it would have cut power when toaster hit water. Asta knew this. She was never in danger as she switched GFCI back on after she got out of tub and Harry left.