Recently, when I was LPing Lemminas II, I remember at some point thinking to myself how I thought it was strange to see "50 Lemmings" instead of "50 Lemminas" on the level preview screen, so this is a great suggestion. Similarly, with Millas sprites, with the word Lemmings replaced with Millas instead, etc.
Along with this, there's probably nothing that can be done about it, but I'll just bring it up anyway: On levels where there's only 1 lemming, I know Lemmings isn't an English game, but it annoys the heck out of me that the preview screen says "1 Lemmings" instead of the grammatically correct "1 Lemming" since one of something means the noun should be singular, not plural. However, I'm being very pendantic here, and again probably nothing can be done about this, so it's fine if this can't be fixed. Let's say that even though I'm a math person and English isn't my strong point despite it being my native language, I still make every effort to correct them in my own writing/posts, so grammatical errors apparently still bother me enough for me to go over what I write.