Took me 2 and a half hours to find the one wrong drum fill in my 1997 Casio keyboard demo tape
I kept thinking my cassette deck was eating the tape at 1:14 of the demo song, but it turned out the keyboard itself has a factory preset with a glitchy snare hit baked right in, and I only figured it out after ripping the audio to my computer and staring at the waveform like a fool, so now I'm wondering if anyone else has a piece of gear with a mistake so baked in that you'd swear it was your own fault.