It is a sweet story with moments that are pretty good.
Unfortunately, between those moments it also has some really slow sections.
It has some fun and it has some real heart, but it also felt like it was about 20 minutes too long. They could have streamlined it a fair amount or added another character or two for him to interact with. More Lydia would have been great and perhaps another new 'friend' that would keep finding him appearing to talk to himself or even a sidekick for Lydia.
While the main characters generally did fine, they just weren't always enough to carry it through so long mostly by themselves. The fun, more lighthearted scenes were great; but the chemistry between the leads and the stronger emotional sections were where they struggled. Those sometimes felt forced. A couple good side characters could have easily distracted from much of that.
There were a fair amount of plot holes and overly convenient moments. Someone shouldn't be completely oblivious to the changes in the world when they can see out windows, front doors to museums aren't usually unlocked and unguarded after hours, if they can see and hear people living in the house over the years it would seem they would pick up slang and exclusive, high end parties aren't generally things that are super easy to just walk into unnoticed, especially out of costume. Like so many movies, it felt like just a bit more time spent on fine tuning the script could have made a big difference.
