Generally, there isn't a notation indicating an account is open. However, closed accounts are noted as such under the "Description" field. If there's nothing indicating the account is closed then the status is open.
Just as a side note, there can be some ambiguity when it comes to the term "Open". There are three key account types: Revolving, Installment, and Open. An Open account is where terms are loosely defined ... utility accounts can show as "Open Account" as well as accounts with no pre-set limit.
Should these accounts actually show as open, I'm not sure why you suspect that it's costing you 50 points (although I suspect you're comparing those scores against your TU). In general, having an account shown as closed costs you points -- the former limits on the account are no longer considered available when calculation your overall credit utilization. I suspect that the 50 point difference is related to other factors (such as a different number of inquiries for one report vs. another).
- Harry