did you hear that uno clarified some rules recently on twitter? I learned I had been playing incorrectly all my life. lol
I love uno! Some of the rules are very confusing. I am sure I have probably been playing wrong also! I did not know that when you put down a draw two or draw four that it is still your turn after the person draws those cards. 
still your turn if you have 3 or more players?
I am not sure! I have no idea! Uno is so easy but so difficult at the same time lol
I learned from their twitter that if someone plays a draw 2 card, if you have a reverse or skip in the same color you can play that card and either send the reverse back to them or skip it to the next person.
If someone plays the wrong card and they get caught then they have to take the card back and draw two additional cards. 
I'm not sure what official rules say, but growing up my siblings and I always made each other draw from the draw pile until we had a card to play. 
I played by that rule also but I know some people will try to play the wrong card and not get caught so they dont have to draw more cards. 
I never tried to get away with playing the wrong card. but I did like to hold my cards together to make it look like I was down to 1 and forgot to say uno so I could make my brothers draw 4 cards if they called me out on it. 
I would do that too! There are so many uno penalties.