First and foremost: Yes to mid-credit AND post-credit scenes, your welcome.
Vent:. If you feel the need to talk during a movie, especially one just released, just don't.
No one wants to hear your voice giving spoilers that you looked up on line.
No one cares what you think of certain plot devices while the movie is still playing
And, just in case you think your cool, no one wants you to make face-noises (also known as 'talking' during the visually exciting yet very quiet FX scene (think the comet impact scene in Deep Impact); you are neither witty or funny... You are very, very sad.