Endeavour Ep. 1 there's a doctor near the start who says digoxin is from Deadly Nightshade. I spent the whole episode thinking he was a fake doctor(*), but it turned out it was just the writers not doing their research.

I was caught off-guard because there's a Midsummer Murders episode where someone forages Hemlock Waterdropwort claiming it was parsley and I cursed the writers for being so slapdash, and it turned out that was the plot!

(*) atropine, scopolamine and hycoscyamine are from Belladonna, but digoxin is from foxgloves.