The image on BoJack's phone for when Mr. Peanutbutter calls him is a red fire hydrant.
BoJack attempted to check Sarah Lynn into a Promises rehab center, the same one Britney Spears and Lindsey Lohan attended, whom Sarah Lynn is likely a parody of.
When Todd is fascinated that Andrew Garfield "Loves lasagna and hates Mondays" the line is a reference to Garfield the cat (as seen in Garfield and Friends (1988)). Garfield the cat is known for loving lasagna and hating Mondays.
At the party a group of party goers cross the screen with bags and boxes labeled "Chips, Dips, Chains, Whips" this is likely a reference to the famous line in Weird Science (1985) where Lisa tells Gary's parents that the party they are going to have will include these exact four things.
When Todd says "He accidently stepped on a needle and is now addicted to heroin" is a reference to Breaking Bad where actor Aaron Paul also played Jesse Pinkman.