In the opening credits letters in the names are highlighted in green so as to represent a chemical element symbol. However, Michael Slovis, the Director of Photography, for several of the beginning episodes, they highlight the Ch. There is no chemical element symbol Ch. After a number of episodes they caught it and thereafter they only highlighted the C.
In the pilot episode Walt is celebrating his 50th birthday, S5 E4 Walt turns 51 and on the series finale he turns 52. However, it isn't until S4 E10 that Walt Jr, aka Flynn, celebrates his 16th birthday and in the finale episode he is coming up in his 18th birthday. The entire span of 6 seasons was to take place in 2 years of story line.
In the opening credits, the "Br" and "Ba" in "Breaking Bad" are presented as if they are entries from a periodic table of elements. The additional pieces of information included are atomic number, atomic mass, oxidation states, and electron shell configuration. Each of these is depicted accurately for both Br (bromine) and Ba (barium), except the electron shell configuration for Ba is copied verbatim from Br. The periodic table that the entry for Ba is visually extracted from contains the correct information. The creators were most likely aware of this, but thought the opening had enough merit to warrant this disregard for correctness under artistic license.