The race of 39 new series to locate an audience is about to begin. Here are some key observations you may or may not know about the primetime landscape this fall.Longest-running scripted drama: “Law & Order,” which debuted Sept. 13, 1990 Longest-running scripted comedy: “The Simpsons,” which debuted Dec. 17, 1989, and is now tied with “The Adventures of Ozzie & Harriet” (1952-66) as the longest-running sitcom in the history of TV Longest running scripted character: Kelsey Grammer as Frasier Crane, who at eight seasons on “Cheers” and 11 on “Frasier” (after this season) is just one year short of the longest running scripted character in the history of TV, Matt Dillon from “Gunsmoke” Four play: The WB’s upcoming “Tarzan” is the fourth television series version of the classic vine-swinging character. Kirk out: A weekly “Star Trek”-related series has been running on UPN or in syndication since 1987. Peacock aging: Six returning scripted series — “ER,” “Frasier,” “Friends,” “Law & Order,” “NYPD Blue” and “The Simpsons” — have reached the 10-year mark. “NYPD Blue” is on ABC, “The Simpsons” is on Fox and the other four nest with the Peacock. Newbies: Tuesday and Friday will feature the most number of new series with eight each. Status quo: No new series will be featured Saturday. Coming back for more: Welcome back, Jason Bateman (“Arrested Development”); with nine series to date he is now just five short of Robert Urich’s record of 14. It’s been awhile: The last time CBS opened the season with a 9 p.m. Wednesday sitcom was “Charlie & Company” in 1985. In mouse years: The last time “Wonderful World of Disney” aired Saturday was in 1982-83. That’s a mouthful: “8 Simple Rules for Dating My Teenage Daughter” is the longest title of any primetime series. Virgin territory: After five sitcom attempts (“Grand,” “Davis Rules,” “The Building,” “Bonnie” and now “Life With Bonnie”), Bonnie Hunt has finally made it into a second season. TGIM: UPN has never had a hit comedy outside of Monday. Iraq and roll: Whoopi Goldberg was featured in failed CBS sitcom “Baghdad Cafe” in 1990. Network shuffle: CBS’ “JAG” originally began on NBC in 1995.