Analysis of information sources in references of the Wikipedia article "Close Rick-counters of the Rick Kind" in English language version.
Eagle-eyed fans of the Disney XD series Gravity Falls may have noticed while watching "Close Rick-Counters Of The Rick Kind" that Grun[k]le Stan's Mug, pen, and notebook that were sucked into a gigantic portal. While Rick and Morty are trying to get the Squanch out of dodge, Rick opens several portals to throw off the Ricks on their tail. One of the portals he opens spits out the exact items Grun[k]le Stan [later] lost in Gravity Falls.
If you look very closely, there's one scene in which a pen, a notepad, and a mug emerge from one of Rick's portals as he attempts to dodge the Council of Ricks. A character on Gravity Falls [later] loses these [same] items in a portal during one episode.
