No, The big Bang Theory didn’t hide Penny’s last name in plain sight.
In the Season 2 episode “The Work Song Nanocluster,” Kaley Cuoco’s Penny puts a package on her kitchen counter — and if you zoom in close enough (at the three-minute mark) you can spot a first and Last name on shipping label: Penny Teller. But as the producers reveal in the new Oral History The Big Bang Theory: The definitive inside story of the epic hit series by Jessica Radloff (order here), the label should be illegible.
“Props had to put a label on it and it just happened to be caught on camera,” explains executive producer Steve Molaro. “We didn’t approve it, we didn’t write it and we didn’t put it there on purpose.”
As prop master Scott London goes on to reveal, it was series co-creator Bill Prady who gave him the surname Teller — as in Penn & Teller — when he approached producers about a nickname. “I had to put a last name on the label,” says London. “I mean, you can’t just tell me to deliver to Penny with no last name!” Prady adds, “I had assured that it wouldn’t be visible, that Scott only needed it for the visual form of the scripture block. But, emphaticallyPenny’s last name is Not Teller. I don’t know how this image of the shipping label exists and how fans could see and recognize it.” But they did did Make it up, and screenshots circulated online.
“Her last name, Teller, is absolutely not canon,” Molaro points out. “The tenet is that she doesn’t have a last name that we’ve ever given her … and we’ll never do one. Even after she and Leonard got married, we made sure we only hear from her [last] name would be.”
at Big BangAt the 2019 wrap party, Cuoco told TVLine’s Michael Ausiello that she fully supported the producers’ decision to never reveal the name. “I kind of love it,” she said at the time. “So many things are revealed in the last few episodes; You will get many satisfying moments. But somehow I love that [we’ll never know her last name]She expresses the same sentiment in the book, adding, “I kind of love that it was just Penny, and then Penny Hofstadter, who I thought was so cute.”
Funnily enough, Teller wasn’t the only girl name assigned to Penny. “I remember looking at the post very early on in a scene that had Penny London in it,” reveals Jim Parsons. “We all found it charmingly amusing that the prop master had given her his last name.”
Oral History also reveals the four well-known actresses who almost got cast as Penny before Cuoco landed the part, which you can read more about here.
https://tvline.com/2022/10/11/big-bang-theory-penny-last-name-teller-explained-kaley-cuoco/ ‘Big Bang Theory’: Penny’s Last Name Explained – Kaley Cuoco