Near the end of "We're Going To The Zoo" squirrels run up Dakota's pants the same as Candance from Phineas and Ferb (2007)
Milo is seen wearing a platypus onesie that looks like Perry the Platypus
One of Brigette's vintage band t-shirts seen on a monkey is for the band Love Handel which appeared frequently in Phineas and Ferb (2007).