I normally book direct through United.com, but have a personal trip coming up where I'm going to book it and absolutely not change it, and Chase Travel gets a few more points earnings.

I know any advance changes I'd want to make I'll have to do through Chase (expedia), but is there anywhere else I'm setting myself up for issues?

Same earnings on United, same Platinum elite benefits, same SDC options? Anything else I should expect to be different beyond the "Contact your point of purchase" message if I try and change the reservation on United.com?

I'm OK with dealing with Expedia in the event of IRROPS on this trip.