I'm sure there was some editing there mixing various camera angles. Still, every missileer loves to actually fire missiles. Hopefully they had some interesting targets. We usually do...
I bet the crews were excited to put that show on. I know it's a lot of work, and many extra hours were spent preparing and executing, but getting to show off for the Commander in Chief is incredibly rewarding.
I would not undersell the training aspect of that in the least. I would think it is extremely valuable anytime you fire anything. I always think of those Trident subs firing a missile-that has to be very satisfying to know you can follow the procedure, it will work, the thing will fire, and hit downrange where it is supposed to.