I should think that you can tell by the poor image quality that you're watching an SD upconverted episode. Besides, the fonts were changed after the demo disc so that they resemble the original font even more closely.
Quotation marks changed slightly. In Season 1 they used the curly quote marks: http://tng.trekcore.com/hd/albums/1x...ost_hd_057.jpg
In Season 2 they used the straight quote marks: http://tng.trekcore.com/hd/albums/2x...per_hd_049.jpg
[but tapered and italicized unlike the sampler disc variant]
They have stuck with the S2 quote marks for S3 onwards.