One problem related to transmission slip out of gear has been reported for the 2014 Honda Odyssey. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2014 Honda Odyssey based on all problems reported for the 2014 Odyssey.
Driving approx 25mph through town when engine rpms increased a bit as it briefly slipped out of gear, then it caught itself and abruptly went into approx 5th gear (6 speed transmission). From there vehicle was only using 2 gears (~2nd and 5th) and every time it up shifted into 5th (from a stoplight, etc. ) it was very abrupt, and made a loud clunk noise - it was so hard it felt like the powertrain was going to be ripped off the engine mounts and out of the engine compartment (seriously). Immediately limped vehicle to closest dealer. Dealer replicated event and determined transmission fluid was overfilled (approx half a quart). This was an issue from the factory and manufacturing process. The selling dealer did not cover/discover this overfill as part of the vehicle sell checklist process (if I were them, not sure I would have noticed a half-quart either). Apparently a half quart makes a big difference in the internal pressure of the transmission which caused this issue. If this would have happened on the highway or otherwise it could have been worse or caused an accident. It was bad enough limping through town. Dealer removed excess fluid and appears to be operating fine (although I now question the longevity of the transmission after this incident). This was obviously an issue during assembly and I am sure I am not the only one that may have been affected. I only assuming that a robot was inadvertently overfilling the fluid on a bunch of transmissions along the way. Can provide VIN as necessary.