From TvLine..
Having Rosenbaum back for the series’ grand finale “was absolutely fantastic,” raves Smallville star Tom Welling, “because it was like he never left. We jumped right back into it.” Coordinating the encore, however, was a veritable job for you-know-who, seeing as the deal was made late in the season and schedules had to be synched. As Rosenbaum recalls, “I called them up on like a Friday, saying: ‘Look, I want to do this, but I’ve go to film this other thing [Fox's Breaking In] — so I’m coming up [to Vancouver] next Thursday.’ And they started writing!” Or rewriting, as the case may be. “We had already started breaking the finale,” executive producer Kelly Souders tells TVLine. “But it was pretty easy and seamless to rev up that story faster.” After all, she notes: “It’s Lex!”
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And a big thanks to Superdog for pointing it out to me:)