On October 4th (Or around that time), Fanlala visited the set of iCarly while they were filming the #310. Around that week, Miranda tweeted "Crazy on set this week. Worked with a cow, a trampoline, and fire!" (Or something like that.) Here are pics!
Pics/Video found at: http://www.youtube.com/watch?v=i1G_LgmTkJM
Also, Miranda Cosgrove was interviewed (http://blogs.kiss985.com/morningshowblog/2010/12/02/5413/) and she said that the last episode they filmed touched on Seddie and Creddie. (Fast forward to 3:08) And yes, she said it in that order. ;)