For some of us of a certain age, the Goo Goo Dolls shows we’ll always remember most fondly were loose, somewhat informal affairs, bolstered by the easygoing banter between John Rzeznik and Robby Takac – the kind of gigs where, if anyone made a mistake, they laughed and kept on going, and if someone yelled something from the crowd, a band member took it and ran with it.On Monday afternoon, the band offered a slightly truncated version of the type of show we used to see at the Continental way back when, granting younger fans who might not have been there in the day the chance to experience their