The Big Mac Index shows the price of a big mac in 2000 at $2.24, and now at $5.58, so that would put $1 in 2000 at $2.49 in 2020 which feels a lot closer to the actual number...but still low because everything "around" the entree has also increased similarly, if not more.
But the chickens now live cage-free and (thanks to California) the pigs will now be able to turn around in their pens.
I think the big one is the people who produce inflation statistics struggle to capture increases when products change, particularly shrinkflation.
The ONS (Who produce the UK inflation statistics) specifically noted limitations in their methodology because when a particular product (whether that's a particular brand, or specific size) is discontinued, they replace it in their subsequent basket with a similar item for measuring inflation but don't measure the change in inflation from the change in product.
For example a 25p can of peas may be withdrawn from sale by the manufacturer, so the next month ONS would switch to checking the price of a 30p can of peas (the next cheapest can). The fact that people who were buying that can of peas now have to pay 5p more for peas is never captured in inflation.
It feels like far fewer restaurants have lunch specials than in 2020, for instance, and a lot of cheap restaurants have either raised prices to the norm or closed. Bars and casinos having discounted or free food to get you to drink has gone out the window (even where legal). And looking back 20 years, it feels like far fewer restaurants have small and simple orders available.
For instance, you used to be able to go into a diner or other casual restaurant and get a hamburger or other sandwich with no fries or side. That’s harder to find now. So is cheap, unremarkable coffee and cheap breakfast items, like small pastries or two-egg plates.
Similarly, it’s harder to find a small car, a house or apartment without central air, a 15 inch TV (though TVs have gotten cheaper), etc.