SORRY, I didn't have time to finish, but it looks from the further video images that you have this all corrected!!! MY FAULT. I will now watch videos all the way through before prematurely posting a dumb comment. SORRY.
Pull-down won't affect the voltage going to the base of the transistor (parallel connection) but it will affect the current (it will reduce it or "split" it). Is this the reason why the value of pull-down resistor should be high? I figured it can never be too high, just too low. In another comment you said "Too low will waste current when the switch is closed and too high of a value might not be able to overpower a stray signal". I'm don't really understand the too high part? What do you mean it will not be able to overpower it? Thank you for the video, the best explanation I've seen! :)
If the base of the transistor is floating (not given a voltage), then stray electromagnetic field signals around it, including things like human touch, can create voltages that might be strong enough to get the transistor conducting. So you want a resistor to the side of the power supply that helps hold the transistor off. There is no current flow at that time. If it is too large of a value though, then it might be over powered by stray signals. Now when the base is given a desired signal voltage to start the transistor conducting, current will also flow through the resistor that was earlier helping to keep the transistor off. So you don't want to go too low either or it will take away too much of the signal voltage that you want applied to the transistor base, it may overheat, or waste energy when the full supply voltage of the supply is across it. Usually a 10K resistor works well. Glad you enjoy, thanks for watching!
What values are your base resistors. You need a pulldown resistor from your NPN base to ground, and a pullup resistor from your PNP base to high. A proper transistor switch would NEVER trigger from a finger-touch!
Pull up and pull down resistor value for a switch circuit isn't important. 10K is really common. Too low will waste current when the switch is closed and too high of a value might not be able to overpower a stray signal.
