from rikers clothing reverting to his tng uniform(some thing beyond the capabilites of a galaxy class holodeck) to the dual riker's in ten forward along with a ferengi, to the wrong stardates to the very basic that riker in pegasus is unrecognizable from the person we see in the thing.
add in more stuff like troi one second being some historian to not being able to tell different museum ships apart to data reverting to first season data.
as for
despite the fact that there was NEVER ANY INDICATION in ANY episode that he EVER had a connection to section 31.
well that is delt with in the book..
spoiler space..
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trip gets recruited by malcolm who is connected with section 31 and harris and due to his report on the romuulan drone plus other factors.,
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but, really none of this has anything to do with what the op was about travis and the horizon.
i like the idea of the horizon being recruited for the purpose as long as it is with warp three engines due to the objection i already gave.
she is so old and as someone else pointed out beyond if she could take the structural stress she may have the wrong configuration for type of engine as well as accomodating its size.