Amazon Studios delivered a memorable presentation yesterday for a number of reasons – not all of them good – at the Summer 2015 Television Critics Association tour. On the upside: It offered five lively panels for compelling new and returning programs the likes of which prove just how far Amazon has come in the streaming content arena in a relatively short time. Collectively, its shows were perhaps the most interesting seen at this tour so far and will probably retain that distinction by the time it ends later next week. On the downside: When they spoke, Amazon Prime’s top executives seemed strangely unrehearsed for actual questions about some of their shows. Worse, Amazon started its presentation a full half hour later than planned and continued it well beyond its arranged end time – a TCA taboo which in this case put Amazon in conflict with a special TCA event planned by 20th Century Fox Television.