I haven't noticed electrical interference with DMT yet, but last time my two roommates and I vaped some, both of their dogs burst out of the tent we were in, and started sprinting around our back yard, barking their asses off in a sort of confused way.
During my first big eye-opening/spiritual experience, however(which was partially fueled by small doses of mushrooms), all kinds of electronics were bugging out all around me. Example: while driving, the radio suddenly started flipping through seriously like a hundred different stations, staying on each for only a few seconds. While on that same drive, the traffic lights of at least three different intersections messed up as we passed through them, either turning all four lights green, all of them red, or just completely going out. It could have been happening more, but I just noticed at the tail end of our drive, and couldn't help but laugh and be fascinated as I was watching it happen. Also, computers would crash, sometimes lights would flicker, and other things like that. I feel like the amazing presence/energy that I tuned into and had coursing through me had some kind of gravity or magnetic field to it that was messing with everything around me. This lasted for a good week or two, then started fading.