Are these witness reports? If they are, I wouldn’t be too concerned. I’d guess that vast majority of people can’t identify a gun’s make with just a quick glance, moreso when it’s being held and/or fired.
If those are the two reports that I heard, I’d be curious about what made the person that said Luger use that term. If you look at Running Coach’s link, Lugers have a pretty distinct look to them. Granted, a random person may not think anything of it, but most people that know even a little about guns would recognize that.
On the other hand, when I hear Beretta, I picture a small gun. I could be totally wrong about that, but in my somewhat uniformed opinion, that’s what I associate them with. IOW, I don’t think someone would use it interchangeably with the word ‘gun’, but they may use it (incorrectly) to mean ‘small gun’. Just like if someone had a large pistol, a random person might call it a Smith and Wesson.
Also, now that I think about it, I wonder if somewhere along the line Ruger turned into Luger. A shooting with a Ruger would make a lot more sense than one with a Luger. As far as guns go, I thought Lugers were more along the line of collectables than OC/CC.