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Samples are always non-DRM, so they're not going to be of any help.
The only DRM-free titles out of all the B&N Classics that have been offered free are Little Women, Pride and Prejudice, and Dracula which everyone gets free for having a B&N account, whether or not they have the CC info necessary for DRM in their account. Presumably this is so people can try out the free books on the Nook app without having to commit to entering payment information.
The erotica offerings from Samhain have always been non-DRM*. Possibly some other publishers who've likewise chosen the DRM-free option will be consistently DRM-free.
But aside from that, unfortunately there's really no way that I've noticed that one could tell just from the product page or sample download, short of acquiring the actual book and testing it in a non-Nook app.
*At least the freebies they offer each month, which are not special editions only for the purpose of being offered free, which leads me to believe that the rest of their regular catalogue is non-DRM.
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