Two bits off the top of my head -- in Something Borrowed, Ianto talks about his father in the past tense, in From out of the Rain, again talking about how his father used to take him to the Electro - so why isn't his dad there? They don't go to the Electro for work, Gwen and Owen just go with Ianto because they have nothing better to do that evening, apparently. (One of the many problems with FOOTR, especially given that it comes right after Gwen's wedding)