Is there a word, or tightly constructed phrase, that means prepared or pre-planned, but has a negative connotation?
The idea being that in some circumstances, it is better to be in the moment and improvising instead of forcing preconceived ideas.
An example use would be something like:
That guy can't let go of the ideas he had when he came in today. He's being totally
_____.
Update: While there have been many close and helpful suggestions, the key element that is still lacking is the concept of pre-existing plans. It's entirely possible for someone to be close-minded or stubborn while improvising new ideas of their own.
It may well be that a term like this doesn't exist, but the right term would not only mean resistant to new ideas from others, but necessarily include having pre-existing ideas as the cause.
Best Answer
I like hidebound for this purpose, which in one of its senses means "stubborn; narrow-minded". Of course narrow-minded ("having restricted or rigid views, and being unreceptive to new ideas" or "intolerant, bigoted or prejudiced") is a possibility too, along with reactionary ("opposed to change; urging a return to a previous state" or "very conservative"), small-minded ("Selfish, petty, constrained in thought, limited in scope of consideration" or "Not interested (or capable) of thinking about the big picture"), insular, monomanic, having a one-track mind ("obsessed with something or only able to think of one thing"), or having tunnel vision (focussing "one's attention on one specific item or event, to the exclusion of everything else").