When Niki Sanders goes into the attic to find the briefcase full of money, the banknotes clearly state "FOR MOTION PICTURE USE ONLY". Also, the banknotes all have the same serial number "G3 00005967 T".
When Darnell flips through the comic books, the second to last cover is "Tales From Space." This is not a real comic but production art created by Andrew Probert, specifically for Back to the Future (1985). It appears during the scene in which Mr. Peabody's kid finds Marty and the DeLorean in their barn.
When we first see Niki and Micah in this episode, the table by their bed has the "smooshed face" wax lion from the show Wonderfalls (2004) sitting on it. Bryan Fuller is the creator and producer of Wonderfalls (2004) and a producer on 'Heroes'.