This was clearly an intentional decision made by Alex Hirsch to foreshadow future events in the show. To label this as a simple “error” is typical of the casual viewer 😂 but, to be fair, you have to have a very high IQ and a solid grasp of theoretical physics to catch on to the nuance and genius within Gravity Falls’ writing and direction. The average viewer isn’t going to catch the smaller details like this, and an even smaller group of viewers will understand the heavy implications and subtle overarching plot advancements within this scene. Can’t blame you for not making the cut among us elites! 😂 Bravo Vince, Bravo.
Bro what your saying is dumb because it foreshadows nothing and honestly you would need a high IQ to know this. This is just a glitch in animation and audio. Also if your just trolling then make it sound less of you bragging about how "smart" you are for knowing this and how you have a high IQ.