The doctors are in (town)

Chicagoans are used to spotting bits of the Windy City on NBC’s hit drama “ER,” which kicks off its fourth season with a one-hour live broadcast at 9 p.m. Thursday on Channel 5. But when they spot the actors walking around their streets, they get a little rabid. For instance, one woman asked George Clooney – who plays womanizing pediatrician Doug Ross – to sign her baby’s Pampers.