On the Norwich penalty - it's in the laws - the ref was correct. If it's in the area and deemed an attempt at playing the ball, then it's penalty+yellow. Basically the intention it to prevent a fair but slightly mistimed challenge getting both a goal and a sending-off double whammy.
"Where a player commits an offence against an opponent within their own penalty area which denies an opponent an obvious goal-scoring opportunity and the referee awards a penalty kick, the offender is cautioned if the offence was an attempt to play the ball; in all other circumstances (e.g. holding, pulling, pushing, no possibility to play the ball etc.) the offending player must be sent off."