Great...
Just watched the movie. Opened a bottle of single malt when it started and drank throughout. Think it was the whisky, but I didn't notice any anachronisms, or plot holes, or bad acting, which normally seriously affect my judgement of the movie. The scenes with the Duke and Lee Marvin are especially enjoyable, particularily when you watch them drink and try and keep up with 'em,(I know it's fake but when you're drinking you don't care). Thus, I recommend any John Wayne fan to drink a half bottle, or a whole bottle of scotch during this movie (or bourbon for you Americans who don't drink scotch).
I often feel nostalgic when I watch older movies, but I felt extremely nostalgic towards the end of the movie when I realised that all these actors are dead and that they'll never make movies like this again (even though these actors died before I was born).
In conclusion, I am going to go back and watch all the John Wayne movies I've seen whilst drinking whisky and see if there is any enhancement...and yes, I was drunk when I wrote this.