Still replaying ch1/ch2. The old knock off controller with yellow and pink buttons that Kris finds in chapter 3 can be seen twice. Once in chapter 1, with Kris being able to look under the bed and find a console + 2 controllers, one legitimate, one knock off.
The second time is a picture on Toriel's work computer, where it's revealed that it was Asriel, not Kris, who used the knock off controller.
Does this have any implications? Especially with how the controller is what allows you to experience Mantle (with Seam also being Asriel's creation and found as a shitty paint file on his PC)