Nothing keeps a creator from inserting language into a work for hire contract that enables use of the created material for self promotion. I've done it. Sometimes you have to negotiate a little (length of excerpt, limitations upon venue [no online posting/YouTube action, but privately distributed demo DVD allowed, for example], "permission shall not be unreasonably withheld," etc.
I find contracts to be very negotiable if you take the right approach. One side wants to be reasonably paid; the other to get what they paid for. Neither wants to be taken advantage of later on down the road. It's usually that simple unless there's a bully in the room. I say goodbye to bullies. They usually turn out to be more trouble than they're worth once the work starts.
Work for hire; use of work product for self promotion
I find contracts to be very negotiable if you take the right approach. One side wants to be reasonably paid; the other to get what they paid for. Neither wants to be taken advantage of later on down the road. It's usually that simple unless there's a bully in the room. I say goodbye to bullies. They usually turn out to be more trouble than they're worth once the work starts.
two cents +/- a penny