Here’s the scene from Alias. It’s unclear whether he had a cane or not. In the second panel on the top, he seems to be holding something in his right hand. It could be his cane or a briefcase. Either way, this scene isn’t as obviously erroneous as the one from this weeks JJ and if they did use this scene as a reference they didn’t pay very close attention to it if they thought Matt would walk around without a cane or a companion if he didn’t have a cane. Again, NITPICKING to the nth degree here because Matt was portrayed well in JJ this week, but it’s perhaps because of that such errors, like him not having a cane when walking around in public when he’s a well known lawyer, stand out all the more.