After Chuck steps on the toy duck, he looks up to see the alien family and their house behind them. However, there is no reflection of this on his visor, just an empty field and the trees beyond.
When the Hazmat team are dropping objects into the containment pod, they drop in a magazine called "G.A." On the cover are a number of titles regarding the making of the movie, including one that reads, "G.A.'s Lifestyle Advice: Go to the Movies to see Planet 51."